Pbocess of making tibe-fillers



E. F. AYCOCK.

PROCESS 0F MAKING TIRE FILLERS.

APPLICATION FILED SEPT.Z`I. 191B.

Patented Sept. 9, 1919.

VENTOR.

WHWESSES.-

v BY

mommy EDWARD F. AYCOCK, 0F MIDLOTHIAN, TEXAS.

PROCESS OF MAKING TIRE-FILLERS.

Specification of Letters Patent.

Patented Sept. 9, 1919.

Application filed September 27, 1918. Serial No. 255,988.

To all 'whom z't may concern:

Be it known that I, EDWARD F. Arcocz, a citizen of the United States residing at Midlothian, in the county of Ellis and State of Texas, have invented certain new and use- :t'ul Improvements in Processes of Making Tire-Fillers, of which the following is a specification.

This invention relates to fillers for tire casings and the process of producing the same.

On May 26th, 1914, Patent No. 1,097,824 was issued to Claude S. Staten for a resilient filler for elastic vehicle tires. This patent covers a filler formed of small elastic particles bonded together but having air chambers between the particles. This liller has been manufactured for some time, but is open to certain objections such as deterioration, disintegration and loss of elasticity.

I have discovered certain improvements in the production of a resilient filler and have evolved a process which has made the same a commercial success. I produce a filler in which the voids or air chambers are reduced to a minimum and a more solid and compact filler produced. Experience shows my ller to be superior, that it will last longer, retains a higher degree of elasticity, does not disintegrate and will hold its shape. In carrying out the process I utilize yieldable or resilient material and have obtained good results by using discarded or Worn out inner tubes, as this gives a grade of rubber which is highly eiiicient. The rubber mate rial lis ground or cut up into small pieces and mixed with a compound composed of rubber cement, gasolene and kerosene or their equivalents. The plastic mass thus produced is placed in a mold or former un der pressure and allowed to remain for a period. This formsthe filler into shape and permits the body to dry to a certain extent. The filler body or unit is removed from the mold and the latter cleaned and wiped dry. After this step the filler unit is replaced in the former and subjected to the usual vulcanizing process.

The invention will be more readily understood from a reading of the following specifcation and by reference to the accompany-` ing drawings, in which an example of the invention is illustrated, and wherein Figure 1 is a transverse section through a tire having a filler constructed in accordance with this invention, and

Fig. 2 is a side elevation of a segment of iiller units which are inserted in the casing.

It is to be understood that this iller is a substitute for the usual inner tube of a pneumatic tire and therefore the ordinary outer casing A is employed. The filler B is made in units or sections shaped to assemble in circular form and completely fill the inner chamber of the casing. In fact the iiller is somewhat compressed when in place in the casing.

In producing the filler the following process is carried out. Discarded or worn inner tubes or similar rubber material is cut up or chopped into small pieces of irregular shape. In order to unite these pieces an adhesive agent must be employed. It is also obvious that the rubber particles mustbe cleaned in order to make the cement adhere thereto. I have greatly reduced the labor by combining the cleaning, cementing and forming operations in a single step.

I prepare a mixture as follows:

One gallon of rubber cement,

One gallon of gasolene,

Three gallons of kerosene.

Tonne gallon of this mixture I add ap. proximately sixty pounds of the rubber pieces or particles and thoroughly mix the ingredients together. All of the particles become covered with this mixture and the gasolene and kerosene act to clean and spread the surfaces of the particles so that the cement adheres thereto.

The next step consists in placing this mixture into molds or formers having the shape in which the filler units are to be produced. These molds are of ordinary semi-circular form and when brought together press the filler into shape. The iiller is permitted to remain in the molds or formers for a period of hours which may vary according to conditions. I have ,found that a period of twelve hours is sufficient but do not care to be limited to this time. has been in the formers for the required period it is removed. The rubber cement will have set to a certain extent and a cer tain evaporation of the oils will have taken place thus leaving the umts more or less After the fillerv lll solid and readily handled. The insides ol the ioriners are cleaned and wiped. dry and sprinkled with a suitable powder such assoapstone or the like after which the units are replaced.

The nent step consists in Vulcaniaing which is carried out under any oi the well known `methods9 although it is preferable to employ the steam vulcanizing process.. The duration oi the yulcanizing period depends upon the density which is desired or the fillerB For ordinary commercial use I have found an hour and twenty minutes to produce F@good results, but this time may be Varied. Alter the units are vulcanized they are removed from the formers and are ready for use. 'Ihe units are placed in the tire casing in successive circumferential order and the casing fastened on the rim.' It

is preferable to make the units of such transversearea that they will be compressed when the tire casing is fastened on the rim.

By observing the drawings it will be seen that the small particles of rubber in the Vfiller B lie in various directions but are in close contact. This is particularly true of the outer surfacet In the Staten filler there were considerable voids or air chambers both through the filler and in the outer surface and it lacked the solidity of my ller which.

at the same time possesses as much if not more resiliency. By employing gasolene and kerosene as I do a better bond is ob tained between the particles and the filler does not lose its shape. A comparison of the filler made under the Staten patent and inlopen that made under this process makes the ditference evident.

l. 'Ihat process of making resilient tire fillers which consists in taking small particles oi resilientl material and mining the saine with a rubber cement softened by gasolene and supported by a vehicle oli kerosene, and compressingr .and Vulcaniaing the noms..

2. The process oi producing a resilient riller lor tire casings which consists in mir.- ing small yparticles of soit rubber with rubber cement, gasolene and kerosene, then placing the mass in a mold and subjecting the saine to pressure for a period of time, then renaud/ing the mass and cleaningl the mold., and then replacing the mass and Vulcanizing the same under pressure. i

- 3. The process of producing a resilient ller for tire casings which consists in preparing a mixture approximately one-fifth rubber cement, one-fifth gasolene and threefifths kerosene to which is added substantially sixty pounds of small rubberparticles, then thoroughly mixing this rna'ss whereby the rubber particles are coated1 then placing the mass in a mold and holding the same under pressure for a period of hours, then removing the mass and cleaning the mold,

'then replacing the mass and vulcanizing the EDWARD r. Aroook. 

